Central-energy electrical temperature-alarm system.



A. GOLDSTEIN & C. H. POOL. CENTRAL ENERGY ELECTRICAL TEMPERATURE ALARM SYSTEM.

APPLICATION FILED JUEEB. 1910.

Patented Nov. 29, 1910.

Qoujc. W. 507.

311 v0, n-lozs J day/ 111830211213 UNiiTED s ra'rns PATENT oF-Froa ises ofas 03 11 ivliom it con-cam:

-- "Be it knownthat we. ALBERT GoLnsrEL' and Ctr-ink" H. Poor, citizens of the United States, residing at ;\ew York, in the county '1 ni N'ew'York and State of New York. have invented a certain new and useful Improvement in Central-Energy Electrical Temperatture-Alarm Systems, of which the following is a specification.

* "The inventioirrelates to a central energy -electrical tempegature alarm system. and

consists in the'construction whereby the 'sending of 'falseralarms by accidental dis rlurbances in electrical conditions on the cirlimit is rendered impossible.

The accompanying drawing is an electtrrcal diagram, in which the system is symbolically represented.

1i'sthefsource'ot current, located at the central station and here shown as a divided loattery. grounded at 2. The magnets 3 and '4 which c'on'trol'ithe glow lamps o, 6, form tloe'translating devices for the signals trans- Elltttli The nae; conductors 7, 8 communi- (rate-with theilistant station at which the remainder ofthefapparatus is located. The transmitter Q has the usual wound clockiwo'rkor other, iiiotor mechanism to rotate, when released. code wheel 10 which opel atesjits switcli'esll. 12 to make and break 1 circuit at contacts 13, 14. ()n the shaft ot 'wheel 10 is a: cam-15, having a rim ot inaulating'material; provided with a notch 16 7 intowhich'entcrsthe bentend of a switch F1 17. When the cam 15 rotates, switch 11'' is caused to close contact with point- 18. and -50 to'establish circuit from switch 11 and contact 14 'to' ground 19. Wheel 10 is pre -wented'tro1n operating by means of a detent-Q0 carried bi the pivoted armature 21 5 circuit at the springs 33, 34., The magnets 36' respectively operate the weighted vi 'lurati'ng spring armatures 37 and 38. Armatrure 3? in vibrating open circuits alt nat'elyat contacts 39, 40, and armatn" vibr ating opens circuit alternately .r

Specification of Letters Patent. gi map n filed June 3, 1am. Serial no, 4 ,745.

I r TEIN'AND' CLARK H. POOL, 0F NEXV YOJdK. N. Y.. ASSIGNORS TO INTER- Zl:A' lICI AL EPECTRIC PROTECTION COMPANY. A CORPORATION OF NE'W YORK.

"assign ent; ELECTRICAL TEMPERATURE-ALARM SYSTEM.

Patented Nov. 29, r910.

' l taets 41, 42. Magnet 43controls switches 44, 45 to make and break circuit at contacts 46, 47. 48, 49, 50. It should be given suiticient lag not to be influenced by the signals.

The sending of the alarm signals is controlled by a thermostat 51, in which 52 is a cup of thin metal, having a vent 53 and a rim flange, upon which flange is secured, by means of a clamping ring 5st and screws. a diaphragm also of thin metal. Centrally placed on the diaphragm is a metal stud 56,

through which in the manner hereafter described, said diaphragm first closes circuit and then operates spring switches 57, 58 to break circuit at contacts 59. G6.

The metallic circuit proceeds as follows: from battery 1, to magnet 3, line wire 7, to junction point 61, Where the circuit dividesone branch proceeding through one coil of neutral magnet 25, to juneticn point 62, and the other branch proceeding through the other coil of magnet 25, to junction 08, switch 26, contact 28, junction 71, wire 63, spring 33, vibrating armature 32, spring 34, spring switch 58, contact 60, wire 64, contact 29, switch 27, wire 65, junction 75, switch it, contact 46, magnet 43, wire 66, switch -15, contact 48, wire 67, to junction 62. The two branches having joined at junction 62, the circuit continues to contact 13, switch 11, contact 14;, switch 12, line wire 8, magnet 4, to battery 1.

The operation of the system is as follows: Upon a rise in temperature of the atmosphere surrounding thermostat 51, in excess of a given rat-eas, for example, three tie-- gress Cent. in one minutethe diaphragm 55 moves its stud 56 into contact with spring switch 57. As any further movement of the diaphragm is resisted by the combined. resiliency of the spring switches 57. 58, it remains stationary for a certain period, until sullicient pressure accumulates to cause it to more said springs away from the contact points 59, (10. During this momentary rest period of diaphragm 55, magnet 43 is shortcircuited by the shunt which proceeds from armature 3-2, to magnet 31, contact 59, spring switch 57, stud 5G, diaphragm and wire 66. The consequent removal of the resistance of magnet -13 from the circuit, unbalauces magnet 25, which opens circuit at and 29, and thus brin magnets 35 and 36 into the circuit. The branch which includes magnet proceeds from junction point- 68, to junction point (39, through contacts 40, 39, to junction point T0. magnet 3.3 and junction point- Tl. The branch which includes magnet. 36 proceeds from contact. 2!), by wire 72, junction point. 73, contacts ill. and junction point 74, magnet 30, to Junction point- 7.3.

During the momentary rest period aforesaid and by reason of the foregoing circuits, the ari nat-ure 32, now controlled by magnet 31, is set in rapid vibration, thus imposing a frequency upon the currents energizing magnets 35, Magnets 35 and 36 then vibrate their weighted spring armatures 3T, 38, which, by reason of their inertia, attain suiiicient amplitude of swing alternately to open circuit at contacts 40, 41 and contacts 39, 42. As magnets 2:2 and 23 are short-circuited through contacts 39, 40 and L1, 42, the opening of these contacts results in the energizing of magnets 22, 23, consequent attraction of armature 21, and. release or" the motor mechanism of wheel 10; which there-upon, in the usual way, sends a code signal to line, which signal is translated by flashes ot' the lamps 5, (E, at the central station.

Particular attention is here directed to the fact that it is only through the frequency current that the magnets 35, 36 are caused to vibrate their weighted spring armatures 37, 38 with an amplitude sufficient to effect the opening of the circuit at the contacts 39, 40 and 41, 42, A continuous current merely causing an attraction of the armatures will .not produce the same result, since the contacts 39, 4-2 are so placed as that the armatures cannot reach them other than by the inertia due to their rapid vibration. Hence a ground on either of the two wires Get, 36, which may extend throughout the premises to be protected, or a crossing between said wires, will not result in an alarm being sent in', because in event of such ground or cross ing, while the magnet 25 is unbalanced and magnets 35 and 36 are brought into the circuit as before, the current which magnets 35 and 36 receive is not. interrupted, but comes direct from battery, and hence their arinatures are merely attracted and, as already described, not moved by their inertia a sufficient further distance to break circuit atthe contacts 39, 42.. In the case of a break on wires 64: or 66,1110 frequency current atiects but oneof the magnets 35 or 36, depending upon the rclative location of the thermostat and the point at which the break occurs. In the case ofa crossing of wires (56 and 64, or a ground on wire 64, magnet 31 no longer receives suflicient current to energize it, and hence; no alarm would-be sent; in.. To meet this difficulty in case it should happen, the further movement of diaphragm 55, which takes place asthe air pressure in cup 52 accumulates, is utilized. By reason of said further movement, the stud 56 raises I spring switches 57, 58 to break circuit at points 51. and (Z-O. The opening of circuit- 1 at point 59 cuts outmagnet 31. The openiug of circuit at point (=0 brings magnetll in fitfllt) between wires (3;! and -l uacircuit then established proceeding as follows: From wire (53, to spring 32 armature 3?, spring 3- wire it magnet 30, wire TS, to wire (54. Magnet 30 then produces the frequency current as magnet 31 did before, but now instead of said curent (in the case of a ground or crossing} atiecting both ma nets 35 and 36, only one of these magnets is energized, depending upon the relative location of the thermostat and the point at which the ground or cro. ing occurs.

The follmving facts will now be apparent. (a) That the transmitter mechanism is released and the alarm signals sent to the central station, only when the frequency current determined by the vibration of armature 32 is competent to cause a vibration of weighted spring armatures 37 and 38 of sufficient amplitude to open the contacts at 39. io, 41, t2. ati'ect magnets 35', 36 to accomplish this result. is g ounds, breaks or crossings on the circuit cannot produce said frequency current, they cannot 2 sources of false alarms. (b) In event of a ground or crossing on the circuit, which might render the means for producing the frequency current inoperative, the continued movement of the diaphragm of the thermostat; results in the sub stitution of another means not so influenced; so that no matter whether the line, at the time of the abnormal ris in temperature which it is desired shall produce an alarm, is clear or impaired by ground or crossing, the signal will nevertheless be sent in. (c) The apparatus at the protected station is energized solely by current from the central station, thus doing away with all local current sources.

\Ve claim: 1

1. An electrical alarm system comprising a line circuit. connecting distant stations, and, at one station, a translating device, and, at a distant station, a transmitter, means operablc only by a certain frequency current for controlling said transmitter to actuate dncing said frequency current.

2. An electrical alarm system comprising a line circuit, a translating device, a transmitter, motor mechanism for said transmitter, a releasing device for said mechanism cont-rolled only by a certain frequency current, and means for producing said current,

a line circuit connecting distantstations, and, at one station, a translating device and a source of current, and, at a distant station, a transmitter, means operable only by a certain frequency current for controlling said Hence no other current will said translating device, and means for pro-' 3. An electrical alarm system comprising transmitter to operatesaid translating device, and means for imposing a frequency on the current from said source.

4. An electrical alarm system comprising a line circuit, a source of current, a transmitter, a translating device, an independently operated means interposed in said circuitfor imposing a certain frequency on said cur rent, and means actuated only by said frequency current for controlling said transmitter.

5. An electrical temperature alarm system comprising a line circuit, a transmitter, a translating device, means operable only by a certain frequency current for controlling said transmitter, and means controlled only by temperature variations for producing said frequency current.

6. An electrical temperature alarm system comprising a metallic circuit, a normally grounded source of current, a ground connection from said circuit, a transmitter in said ground connection, a translating device, means actuated by a frequency current for controlling the operation of said transmitter, and an air thermostat having a vibrating member interposed in said circuit and imposing frequency on said current.

7. An electrical alarm system comprising a line circuit, a source of current, a transmitter and motor mechanism therefor, a

' translating device, means controlled by tom-i perature variations to produce a frequency on said current, a magnet energized by said frequency current, a vibrating switch controlled by said magnet, and a releasing device for said motor mechanism controlled by said switch.

8. An electrical alarm system comprising a line circuit, a source of current, a transmitter, a translating device, means for controlling said transmitter operable only by a current of different character from that on said line circuit, and two devices for pro- (lucing said current difference, one of said devices operating under normal conditions, and the other of said devices operating only upon the failure of said first device due to abnormal conditions on the cu f-N l- 9. An electrical alarm system comprising a line circuit, a source of current, a transmit ter, a translating device, two devices for controlling said transmitter operable only by a current of different character from that on said line circuit, and two devices for producing said current difference, one of said current difference producing devices operating under normal conditions both of said controlling devices, and the other of said current difference producing devices operat: ing one or the other of said controlling devices only upon the failure of said firstnamed current difference producing device dueto abnormal conditions on thecircuit.

10. An electrical alarm system comprising a line circuit, a source of current, a transmitter, a translating device, two devices for controlling said transmitter operable only by a current of difi'erent character from that on said line circuit, and two devices for producing said current difference, one of said current difi erence producing devices operatmg under normal condi n both of s d controlling (leVlQQS, and under certain abnormal conditions one 01 the other of said controlling devices.

In testimony whereof We ha Hfi'iXed 011 signatures in presence of two Witnesses.

ALBERT GOLDSTEIN. CLARK H. POOL.

Witnesses GERTRUDE T. PORTER, MAY T. MoGARnY. 

